Robuta

https://indico.math.cnrs.fr/event/393/?view=event Scalar Curvature, Gauss-Bonnet Theorem and Einstein-Hilbert Action for Noncommutative Tori... Geometric spaces are described by spectral triples (A, H, D) in non-commutative geometry. In this context, A is an involutive noncommutative algebra... gauss bonnet theoremscalar curvaturehilbert actioneinsteinnoncommutative